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 Technical task
        
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    Resolution: Done
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P2: Important
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    None
 
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        471a6cbd07fddd3f392204d532ac8d3639c7dc7f
 
Fix the changed APIs in C++ API rendering path.
- Some includes have moved to QtOpenGL module from QtGui
	
- QOpenGLFunctions_2_1
 
 - Some APIs have been removed, and require conversion to available APIs or other sort of replacement
	
- QRegExp to be replaced with QRegularExpression
 - QOpenGLContext::currentContext()->versionFunctions<QOpenGLFunctions_2_1>(); has been removed
 - glPointSize is missing, as a result of the previous item